Properties and influence of microstructure and crystal defects in Fe$_2$VAl modified by laser surface remelting

Laser surface remelting can be used to manipulate the microstructure of cast material. Here, we present a detailed analysis of the microstructure of Fe$_2$VAl following laser surface remelting. Within the melt pool, elongated grains grow nearly epitaxially from the heat-affected zone. These grains a...

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Bibliographic Details
Main Authors Gomell, Leonie, Roscher, Moritz, Bishara, Hanna, Jägle, Eric, Scheu, Christina, Gault, Baptiste
Format Journal Article
LanguageEnglish
Published 16.09.2020
Subjects
Physics - Materials Science
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Summary:Laser surface remelting can be used to manipulate the microstructure of cast material. Here, we present a detailed analysis of the microstructure of Fe$_2$VAl following laser surface remelting. Within the melt pool, elongated grains grow nearly epitaxially from the heat-affected zone. These grains are separated by low-angle grain boundaries with 1{\deg}-5{\deg} misorientations. Segregation of vanadium, carbon, and nitrogen at grain boundaries and dislocations is observed using atom probe tomography. The local electrical resistivity was measured by an in-situ four-point-probe technique. A smaller increase in electrical resistivity is observed at these low-angle grain boundaries compared to high-angle grain boundaries in a cast sample. This indicates that grain boundary engineering could potentially be used to manipulate thermoelectric properties.
DOI:10.48550/arxiv.2009.07685